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An Improved High Efficiency Resonant Converter for the Contactless Power Supply with a Low Coupling Transformer  

Kong Young-Su (전주대 공대 전기전자공학과)
Kim Eun-Soo (전주대 공대 전기전자공학과)
Lee Hyun-Kwan (전주대 공대 전기전자공학과)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers B / v.54, no.1, 2005 , pp. 33-39 More about this Journal
Abstract
Comparing with the conventional transformer without the air gap, a contactless transformer with the large air gap between the long primary winding and the secondary winding has increased leakage inductance and reduced magnetizing inductance. For transferring the primary power to the secondary one, the high frequency series resonant converter has been widely used for the contactless power supply system with the large air gap and the increased leakage inductance of the contactless transformer However, the high frequency series resonant converter has the disadvantages of the low efficiency and high voltage gain characteristics in the overall load range due to the large air gap and the circulating magnetizing current. In this paper, the characteristics of the high efficiency and unit voltage gain are revealed in the proposed three-level series-parallel resonant converter. The results are verified on the simulation based on the theoretical analysis and the 5kW experimental prototype.
Keywords
Contactless Power Supply System; Contactless Transformer; SRC(Series Resonant Converter); SPRC(Series Parallel Resonant Converter);
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